Mercury 20hp thunderbolt What year "With Pictures"

[jasoninsane123]

I just got this motor for free i see its missing the start no big deal but I'm trying to fig out what year the motor is i looked in the 4 posted sites on here and i couldn't find the serial number i found on the motor.

Here is the serial number i got = 1427-3264 i think this is the right number...

 

[shoestring]

Re: Mercury 20hp thunderbolt What year

Re: Mercury 20hp thunderbolt What year

that serial number sounds like early sixty's model, are you sure it is a 20 hp, post a pic if you can. ss

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year

Re: Mercury 20hp thunderbolt What year

I will go take a picture right now and post it for you

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year

Re: Mercury 20hp thunderbolt What year

Here are the pictures

 

[shoestring]

Re: Mercury 20hp thunderbolt What year "With Pictures"

late 60's to maybe 70 or so. serial number doesn't jive. check again for more numbers. ss

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year "With Pictures"

Would you know where they would be at i looked all over and those are the only one i seen and these


1022-3567

 

[shoestring]

Re: Mercury 20hp thunderbolt What year "With Pictures"

between the transom clamp screws on top. there should be a data plate riveted on there. just below the choke knob

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year "With Pictures"

I looked there is nothing

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year "With Pictures"

I notice its missing a start and who else knows if i take some pics of the motor can you guys let me know if its missing anything else i want to get this thing running

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year "With Pictures"

Is there a other place where the serial number would be

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year "With Pictures"

Bump

 

[emckelvy]

Re: Mercury 20hp thunderbolt What year "With Pictures"

If the covers are original, it's a '68-'71 model.

Serial # range would be from 2296267 to less than 3226958 (the starting # of the 1972 model run).

A further way to narrow down the year would be that 1968-69 models have conventional ignition, with the ign coils under the flywheel. '70-'71 models are CDI ign and have (2) ign coils mounted externally on the aft upper part of the powerhead.

Std ign models take an L77JC4 spark plug while electronic ign models use a surface-gap L78V. These are Champions or use the crossover equivalents for other brands.

You can look up parts for your motor, by serial #, at this site:

http://www.mercruiserparts.com/selectModels3.asp?type_id=MERC

Their parts diagrams should help you figure out what you've got.

HTH...........ed

 

[jasoninsane123]

Re: Mercury 20hp thunderbolt What year "With Pictures"

Its a 70-71 model now i just got to fig out whats missing and what i need